Yolk-double shell Fe3O4@C@C composite as high-performance anode materials for lithium-ion batteries

Herein, yolk-double shell Fe 3 O 4 @C@C nanospheres (YDS-FCCNs) were designed and synthesized via solvothermal and following heat management. The as-obtained yolk-shell morphology consisted by two parts: one for the Fe 3 O 4 @C nanosphere (diameter about 100 nm) as core, and the other for nitrogen-doped carbon (thickness about 50 nm) as the shell. The YDS-FCCNs composite exhibited preeminent cycling stability of 780 mAh/g at 0.5 A/g after 500 cycles, even at higher current density of 2 A/g, it still retained a reversible capacity of 559 mAh/g after 500 cycle. The good electrochemical performance could attribute to the following factors: First, the hierarchical double carbon shell could prevent the agglomeration of the Fe 3 O 4 , meanwhile largely enhance the electrical conductivity . Second, the synergistic effects for multilayered structure and atomic doping could improve the comprehensive electrochemical performance.